NVJPEGEncoder not compress frame

Robotics & Edge Computing Jetson Systems Jetson AGX Xavier
,
1

Hi,

my setup JP4.6.1 AGX, imx264 2448x2048.

This code compress frame:

EGLStream::IImageJPEG * iJPEG{ Argus::interface_cast< EGLStream::IImageJPEG >( iFrame->getImage() ) };
                    if( iJPEG )
                    {
                        const auto file{ m_recordPath + "/" + std::to_string( cameraId ) + "/" + std::to_string( framesNum.at( cameraId ) ) + ".jpg" };
                        if( iJPEG->writeJPEG( file.c_str() ) != Argus::STATUS_OK )
                        {
                            std::cout << "Failed to write JPEG: " << file << std::endl;
                        }
                    }

This does not:


                    EGLStream::NV::IImageNativeBuffer * iNativeBuffer{ Argus::interface_cast< EGLStream::NV::IImageNativeBuffer >( iFrame->getImage()) };
                    if( not iNativeBuffer )
                        std::cout << "IImageNativeBuffer not supported by Image!" << std::endl;
                    else
                    {
                        if( m_dmaBuffers.at( cameraId ) == - 1 )
                        {
                            m_dmaBuffers.at( cameraId ) = iNativeBuffer->createNvBuffer( frameSize,
                                                                                         NvBufferColorFormat_YUV420,
                                                                                         NvBufferLayout_BlockLinear );
                        }

                        if( m_dmaBuffers.at( cameraId ) != - 1 )
                        {
                            if( iNativeBuffer->copyToNvBuffer( m_dmaBuffers.at( cameraId ) ) != Argus::STATUS_OK )
                            {
                                std::cout << "Failed to copy frame to NvBuffer!" << std::endl;
                            } else
                            {
                                const auto filename{ m_recordPath + "/" + std::to_string( cameraId ) + "/" + std::to_string( framesNum.at( cameraId ) ) + ".jpg" };
                                std::ofstream outputFile{ filename };
                                if( outputFile.is_open() )
                                {
                                    uint8_t * buffer = m_OutputBuffers.at( cameraId );
                                    unsigned long size{ bufferSize };
                                    m_JpegEncoders.at( cameraId )->encodeFromFd( m_dmaBuffers.at( cameraId ), JCS_YCbCr, & buffer, size );
                                    outputFile.write( ( char * ) buffer, bufferSize );
                                }
                            }
                        } else
                            std::cout << "Failed to create NvBuffer!" << std::endl;
                    }

First case file size about 200-400KB
Next one always 7.5MB as buffer size.

Please explain me that.

Best regards, Viktor.

3

Hi,
Please check and confirm if the fd is valid. For further investigation, please compare the code to the reference sample:

/usr/src/jetson_multimedia_api/samples/05_jpeg_encode
4

Sorry, my mistake.

size should be rewritable.

m_JpegEncoders.at( cameraId )->encodeFromFd( m_dmaBuffers.at( cameraId ), JCS_YCbCr, & buffer, size );
outputFile.write( ( char * ) buffer, size );